132 
Y. TANAKA. 
characters. On this assumption we may expect two forms of the offspring, 
striped yellow and normal white, in equal numbers. The pedigree may be 
given diagramatically as follows : 
1911 SnYsny x sNysNy 
Striped yellow 
Normal white 
Gametes 
1912 
Ratio 
Observed 
Calculated 
SnY, sny 
SnYsNy 
1 striped yellow 
215 
201.5 
sNy 
snysNy 
1 normal white 
188 
201.5 
VI. Tables. 
In the following Tables will be given the genealogical relations, genetic 
constitutions, theoretical expectations and actual figures of the various lots of 
silkworms used in the present research. It is hoped that these Tables will 
serve to give a clearer understanding of the foregoing descriptions. 
Table I. 
Plain Series. 
Lot No. 
Apparent characters 
Genetic formulae 
Segre- 
gation 
Gametes 
Lot No. 
Zygotic 
formulae 
Apparent 
characters 
Ratio 
Actual 
figures 
Expe< 
tatioi 
P. 1. ’10 
Plain yellow 
szmnYszmnY 
normal 
szmnY 
P. 1. ’ll 
szmnYszmnY 
plain yellow 
all 
all 
all 
P. 1. ’ll 
Plain yellow 
szmnYszmnY 
” 
szmnY 
P. 1. ’12 
szmnYszmnY 
plain yellow 
all 
229 
229 
